Evinrude E-NATION, for those dedicated to water, power, fishing and fun
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Skipper
Posts: 6
Registered: ‎02-26-2012

gen 1 250 ho rpm loss

the motor will run fine at wot for a time then lose 200 rpm  could this be a fuel pump going bad or something else

Admiral
Posts: 8,508
Registered: ‎07-14-2011

Re: gen 1 250 ho rpm loss

A 200 rpm loss could be from a number of things such as the air warming up to the knock sensor cutting back timing due to detonation signals from a fuel restriction. It would be best to have a trained technician with a fuel pressure gauge, fuel vacuum gauge, and a laptop with the diagnostic software to go for a water test with you. From that information, the tech could determine what was the cause for the drop in rpm.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.


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Skipper
Posts: 6
Registered: ‎02-26-2012

Re: gen 1 250 ho rpm loss

dealer found injector 3 failed no code on computer  do yo think this damaged the piston

Admiral
Posts: 8,508
Registered: ‎07-14-2011

Re: gen 1 250 ho rpm loss

 

A technician should check the compress or perform a leakdown test on the #3 cylinder and compare it to the others. With the availability of low cost "bore-scopes", a visual inspection of the cylinder walls and piston crown would be recommended. Those procedures will show if there is any damage to the engine.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.